Entity scope
This profile covers the diverse mosquito family Culicidae. Species, activity time, breeding water, hosts, range, and ability to transmit pathogens vary greatly.
Quick identity
- Taxonomic family
- Culicidae
- Adult form
- Slender fly with one pair of wings, long legs, and a proboscis
- Immature habitat
- Eggs, larvae, and pupae develop in water
- Biting sex
- Females bite; males do not take blood meals
- Disease boundary
- Only some species and infected individuals transmit particular pathogens
- Visual status
- NO_VISUAL — family diversity makes one image incomplete
Key characteristics
- Adults are slender two-winged insects with long legs and a projecting proboscis.
- Larvae and pupae are aquatic and look very different from adults.
- Species-level separation often needs scales, markings, anatomy, range, and collection context.
- You cannot tell whether a mosquito carries a pathogen from its appearance or from the bite.
Life stages
01
Egg
Laid in or near water; placement and form vary among mosquito groups.
02
Larva
Aquatic feeding stage, often visible moving in water.
03
Pupa
Aquatic non-feeding stage before adult emergence.
04
Adult
Flying stage; females of many species take blood meals for egg production.
Where it is found
- Fresh, stagnant, temporary, or container water depending on species; some need only small water volumes.
- Adults rest and feed indoors or outdoors, by day or night, depending on species.
Behavior and activity
- Only females bite people and animals; both sexes use plant sugars.
- Host preference and activity time differ among genera and species.
- Local surveillance and geography, not one insect photo, define relevant pathogen risk.
Diet and resources
- Aquatic immature habitat with suitable organic resources.
- Adult plant sugars; females of many species require blood for egg development.
Associated signs
Repeated adults plus larvae or pupae in a specific water source support local breeding; bites alone do not locate the source.
Common lookalikes
Similar slender flies without the same blood-feeding context.
Small indoor flies often linked to moist potting media.
Much larger long-legged flies that do not bite people.
Why it matters
A mosquito or bite does not diagnose disease
Some mosquito species can transmit particular pathogens when local transmission conditions are present; many mosquitoes are nuisance biters that do not spread germs.
- Seek medical advice for fever or other concerning illness after relevant travel or local exposure; urgent symptoms need urgent care.
- Use current local public-health advice because species, seasons, and pathogen activity differ by place and time.
- Do not infer infection from swelling, bite pattern, or the appearance of a mosquito.
Management direction
- Document the adult or aquatic stages and the exact water or activity context.
- Use local public-health and mosquito-control guidance for current risk and source reduction.
- Follow repellent and pesticide labels; detailed control belongs in Guide content, not this Profile.
Have a pest photo to check?
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Identify a photoReviewed guidance and sources
Last reviewed August 2026. Sources support the claims listed with them; their limits remain part of the review.
- CDC — About Mosquitoes
Supports: Global family diversity, adult anatomy, biting sex, broad lifecycle, and vector-versus-nuisance boundary.
Does not support: Species identity, infection status, or disease diagnosis from one mosquito or bite.
Scope note: Guidance and risk vary by geography, exposure, and individual health context.
- CDC — About Mosquitoes in the United States
Supports: U.S. species and surveillance context and why appearance cannot reveal pathogen transmission.
Does not support: Risk outside the United States or current local outbreak status.
Scope note: Explicitly U.S.-specific and time-sensitive; use local public-health surveillance elsewhere.